add read me

venv/lib/python3.12/site-packages/sympy/integrals/benchmarks/bench_integrate.py

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+from sympy.core.symbol import Symbol
+from sympy.functions.elementary.trigonometric import sin
+from sympy.integrals.integrals import integrate
+
+x = Symbol('x')
+
+
+def bench_integrate_sin():
+    integrate(sin(x), x)
+
+
+def bench_integrate_x1sin():
+    integrate(x**1*sin(x), x)
+
+
+def bench_integrate_x2sin():
+    integrate(x**2*sin(x), x)
+
+
+def bench_integrate_x3sin():
+    integrate(x**3*sin(x), x)

venv/lib/python3.12/site-packages/sympy/integrals/benchmarks/bench_trigintegrate.py

@@ -0,0 +1,13 @@
+from sympy.core.symbol import Symbol
+from sympy.functions.elementary.trigonometric import sin
+from sympy.integrals.trigonometry import trigintegrate
+
+x = Symbol('x')
+
+
+def timeit_trigintegrate_sin3x():
+    trigintegrate(sin(x)**3, x)
+
+
+def timeit_trigintegrate_x2():
+    trigintegrate(x**2, x)  # -> None